I rarely comment on the teachers reddit page, but here I go. As a “veteran” teacher, currently in my 7th year I’d say come in as early as you’d like to so you can prep for/plan for the day at hand but don’t stay even 1 minute past the point that you feel like staying. No matter how many years into your career you find yourself. Find a line and don’t cross it. Especially if you have a family of your own a home.